fix: human-readable text output for simple commands

[margaretjgu]

Summary

Closes #379

• elastic version now prints 0.2.1 instead of { "version": "0.2.1" } — bare string, easy to pipe
• elastic config context list now prints a * current / other bullet list instead of JSON
• elastic config context add/edit/remove now prints Context '<name>' added/updated/removed. plus any warnings
• elastic config current-context get now prints just the context name
• elastic config current-context set now prints Switched to context '<name>'. plus any warnings
• renderText now renders single flat objects as key: value lines instead of falling through to JSON.stringify, which improves all extension commands (extension install, extension remove, etc.) for free
• --json output is unchanged throughout; all config integration tests pass using --json

Test plan

• npx tsc --noEmit passes
• npx tsx --test test/output.test.ts test/factory.test.ts — 313 tests, 0 failures
• Manually verify: elastic version, elastic config context list, elastic config context add, elastic config current-context get/set

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	7.02s
✅ REPOSITORY	gitleaks	yes		no	no	63.19s
✅ REPOSITORY	git_diff	yes		no	no	0.54s
✅ REPOSITORY	secretlint	yes		no	no	32.89s
✅ REPOSITORY	trivy	yes		no	no	18.0s
✅ TYPESCRIPT	eslint	5		0	0	4.43s

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